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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AMDGPU][MC][GFX10] GLOBAL and FLAT atomics discard dlc modifier"
href="https://bugs.llvm.org/show_bug.cgi?id=51717">51717</a>
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<th>Summary</th>
<td>[AMDGPU][MC][GFX10] GLOBAL and FLAT atomics discard dlc modifier
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: AMDGPU
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>d-pre@mail.ru
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>GLOBAL and FLAT atomics accept dlc modifier but it is silently discarded.
An example:
flat_atomic_add v[1:2], v2
flat_atomic_add v[1:2], v2 dlc
Both instructions are assembled into the same code with zero dlc bit:
0x00,0x00,0xc8,0xdc,0x01,0x02,0x7d,0x00
AMD documentation does not describe any limitations on use of dlc with atomics
so the questions are:
1. Is dlc discarded on purpose?
2. If yes, should validator be corrected to trigger an error for atomics
with dlc?</pre>
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